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Verify mod PCM callbacks follow the guest SPU clock

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This commit is contained in:
Matthew Stanley
2026-10-24 23:52:08 -07:00
parent f29503ffcd
commit 8c87b03241
1 changed files with 41 additions and 0 deletions
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runtime/tests/test_spu_guest_clock.c
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@@ -122,10 +122,51 @@ static void test_gate_and_rewind(void) {
"a rewound guest clock re-anchors without rendering");
}
static uint32_t pcm_frames;
static void pcm_overlay_test(int16_t* stereo, uint32_t frames) {
pcm_frames += frames;
for (uint32_t i = 0; i < frames * 2u; ++i) stereo[i] = 1234;
}
static void test_pcm_overlay_uses_guest_clock(void) {
g_cycle = 0;
spu_init();
spu_set_pcm_overlay(pcm_overlay_test);
spu_catch_up();
g_cycle += 768u * 3u;
spu_catch_up();
CHECK(pcm_frames == 3u && spu_output_available() == 3u,
"PCM overlay advances with guest samples while the native SPU is off");
int16_t output[8];
CHECK(spu_output_pop(output, 4u) == 3u && output[0] == 1234 &&
output[5] == 1234 && pcm_frames == 3u,
"host output consumption neither skips nor advances mod playback");
spu_set_output_gate(suppressed);
s_suppress = 1;
g_cycle += 768u * 2u;
spu_catch_up();
CHECK(pcm_frames == 5u && spu_output_available() == 0u,
"suppressed output still advances deterministic mod PCM state");
s_suppress = 0;
spu_set_output_gate(NULL);
spu_write(0x1F801DAAu, 0x8000u);
g_cycle += 768u * 4u;
spu_catch_up();
CHECK(pcm_frames == 9u && spu_output_available() == 4u,
"native voice-free fast path advances the same mod PCM clock");
spu_set_pcm_overlay(NULL);
spu_output_flush();
g_cycle += 768u;
spu_catch_up();
CHECK(pcm_frames == 9u && spu_output_pop(output, 4u) == 1u && output[0] == 0,
"unbinding restores native silence without advancing mod playback");
}
int main(void) {
test_envelope_rises_between_accesses();
test_snapshot_keeps_clock_phase();
test_gate_and_rewind();
test_pcm_overlay_uses_guest_clock();
if (failures) { fprintf(stderr, "%d failure(s)\n", failures); return 1; }
puts("spu_guest_clock_test: ok");
return 0;